Text file reader

TextReader.py

import sys,time,os
try:
  file = open(sys.argv[1])
except IndexError:
	print "Error: please provide a file"
	raw_input( "Press any key to exit")
print "Opened {0}".format(sys.argv[1])

lines = ""

def PrintLine(line):
	global lines
	word = ""
	for char in line:
		time.sleep(0.1)
		os.system("cls")
		print lines
		word+=char
		print(word)
	lines += word
	



for line in file:
	PrintLine(line)